二维半导体的相干声学声子研究进展  

Research Progress of Coherent Acoustic Phonons in Two-dimensional Semiconductors

作　　者：许文雄 张何 崔乾楠 徐春祥 XU Wenxiong;ZHANG He;CUI Qiannan;XU Chunxiang(National Key Laboratory of Digital Medical Engineering,School of Biological Science and Medical Engineering,Southeast University,Nanjing 210096,China;School of Electronic Science and Engineering,Southeast University,Nanjing 210096,China)

机构地区：[1]东南大学生物科学与医学工程学院,数字医学工程全国重点实验室,江苏南京210096 [2]东南大学电子科学与工程学院,江苏南京210096

出　　处：《发光学报》2024年第8期1232-1246,共15页Chinese Journal of Luminescence

基　　金：国家自然科学基金(62335003,61704024,61821002,61904082);江苏省自然科学基金(BK20222007)。

摘　　要：飞秒脉冲激光激发固体薄膜材料产生的相干声学声子可以快速无损获取发光材料与器件结构特性,对于光电器件功能界面的无损检测及成像具有重要意义。相较于热弹性机制的传统金属薄膜光声换能器,二维半导体材料具备宽谱吸收、表面原子级平整、层数易控等优良特性。飞秒激光激发二维半导体能原位产生相干声学声子振荡,为进一步发射超快声波脉冲获取界面信息创造了条件,广泛适用于无损评测发光器件的缺陷分布、力学性能和界面品质。本文主要介绍二维半导体中相干声学声子的研究进展,并讨论利用超快光声转换的高穿透深度、高时空分辨测量技术重大的科学意义与社会价值。The coherent acoustic phonons generated by femtosecond laser pulse excitation of thin-film materials can obtain non-destructive interface structure characteristics of light-emitting materials and devices.It is important for nondestructive testing and imaging of functional interfaces of opto-electronic devices.Compared with traditional metal thinfilm photoacoustic transducers with thermoelastic mechanisms,two-dimensional semiconductor films own the advantages of broad spectrum absorption,atomic-level surface flatness,and robust control of the layer number.During the interaction of femtosecond laser pulse and two-dimensional semiconductor,coherent acoustic phonon oscillation can be generated,which set a foundation for further launching ultrafast acoustic pulses to extract interface information.This should be widely applicable for nondestructive evaluation of defect distribution,mechanical properties,and interface quality of light-emitting devices.In this paper,we introduce the research progress of coherent acoustic phonons in two-dimensional semiconductors and overlook the scientific significance of ultrafast opto-acoustic measurement technique.

关 键 词：二维半导体 异质界面 相干声学声子 

分 类 号：O433.5[机械工程—光学工程]